Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1b4f2916a7a393…

MALICIOUS

PDF

54.7 KB Created: 2020-08-08 22:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f5661c882bf05d6cd32e24e2cc1eadb SHA-1: 647f3fd0122368a3a056fd4251d250730ece619a SHA-256: 6f1b4f2916a7a393a00b140cd9e66f9c15148029ae4a481526252bf2abf7aee8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.com) that is known to host malicious content. The document body itself is heavily obfuscated but contains the same redirector URL. The presence of numerous PDF links suggests an attempt to manipulate search engine results or distribute malware through a link farm. No scripts were extracted, but the primary attack vector appears to be directing users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wb?keyword=babies%20r%20us%20umbrella%20stroller%20manual
    • http://dejexi.1stophairshopgc.com/uploads/1/3/0/8/130814328/1026080.pdf
    • http://gipejuki.carmendesousabooks.com/uploads/1/3/1/3/131383483/wazejarivifubemus.pdf
    • http://files.autismstressalert.org/uploads/1/3/0/7/130740130/sobejitaz.pdf
    • http://files.jaxwoodworkers.org/uploads/1/3/0/9/130970014/devoj.pdf
    • http://files.redroomyoga.com/uploads/1/3/2/8/132814306/bekijoka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8320/9631/files/goxikekovojegimijimu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5517/8150/files/surisarezisol.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/44787876084.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/bangladesh_political_map.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/dumb_and_dumber_pretty_bird.pdf
    • https://cdn.shopify.com/s/files/1/0431/0047/1456/files/36997979100.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2507/files/44214401739.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/how_to_install_ai_dungeon_2.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/38333551893.pdf
    • https://cdn.shopify.com/s/files/1/0439/0577/7832/files/jivolifoxubegaxeboto.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/63398776566.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009950.bin
9c16c6d12480d751d9bf841fa6cd7921e37fddaa15e95fd21f94d311a7f20f59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9950 5020 bytes
font_01_sfnt_off0000aa46.bin
55f9e1e651f389bacc949a695be9be675a76174f3fa9670584f40dcaaf6d4a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA46 10304 bytes

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